4. Vacuum Elevator: One final type of elevator, the Pneumatic Home Vacuum Elevator (PVE), is self supporting and uses minimal electricity as it employs gravity to descend. PVE offers three different models, ranging from single passenger to a three passenger, wheelchair-accessible model. Some of today’s popular elevator brands include Symmetry, Garaventa, Savaria, Harmar and Waupaca. (Image via Savaria Elevators)